No. The story (probably invented by some parent who did not want to try raising a baby bird) is that if you touch the baby bird, the parents will smell your scent and abandon it. Most birds have a VERY poor sense of smell, and not only will the parents not abandon the baby, they very well might try to chase you away. As soon as you move away, the parents will resume feeding and watching over the baby. Unless you are rescuing the baby from a cat or your little brother, it is best to leave them alone.